
B–61863E/15
1. SEQUENCE PROGRAM
CREATING PROCEDURE
PMC SEQUENCE PROGRAM
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CAUTION
1 The above table does not contain simple addition of reserved areas for PMC addresses that
are not used by the ladder.
2 Execution time–dependent ladder
As instruction execution becomes faster, the following changes may occur in the execution
timing:
S Change in the execution cycle of the second ladder level
S Change in timing for the second–level split and first–level execution
S Change in timing for ladder execution and I/O transfer
A ladder which can be operated on the 16i/18i/21i–A must also be checked for operation on
the 16i/18i/21i–B system.
3 Changes in memory capacities required for a sequence program (PMC–SB7)
As described in Section 2.8, the memory capacities required for the system and
symbol/comment data have been changed. As a result, the capacity of flash ROM is increased
as compared with the PMC–SA5/SB5/SB6, even for the same source program. If a created
sequence program exceeds the capacity of flash ROM, add the step count option or delete
unnecessary symbols and comments.
4 Screen display and operation
The PMC–SB7 has much the same screen display/operation system as the
PMC–SA5/SB5/SB6. Some operations for the PMC–SA5/SB5/SB6 have been modified to
improve operability and functionality, however. The same goes for the PMC–SA1. For details,
see Chapter 1, ”SCREEN OPERATION FOR PMC–SA1/SB7” in Part V.
5 PMC parameter input/output (PMC–SB7)
With increase in size of a PMC parameter (T, C, K, and D areas), the data format used for
inputting PMC parameters from a memory card or floppy disk (FANUC Handy File) or outputting
them to it on the PMC I/O screen has been extended.
S PMC parameters output by the PMC–SA5/SB5/SB6 can be read by the PMC–SB7.
S PMC parameters output by the PMC–SB7 cannot be read by the PMC–SA5/SB5/SB6.
An extension relay (E area) has been added as a PMC address. A PMC parameter input or
output by the PMC–SB7 contains the E area. If a PMC parameter output by the PMC–SB7 is
read, the E area is initialized to the status when the PMC parameter is output.